CosmicVariance.com - Discover magazine's blog of astrophysics news
Title
Cosmic Variance
Description
What we’re about
Cosmic Variance is a group blog by five people who, coincidentally or not, all happen to be physicists and astrophysicists: Mark Trodden, Risa Wechsler, Sean Carroll, Clifford Johnson, and JoAnne Hewett. Our day (and night) jobs notwithstanding, the blog is about whatever we find interesting — science, to be sure, but also arts, politics, culture, technology, academia, and miscellaneous trivia. We have similar outlooks on many things, widely disparate opinions about others, and will do our best to keep the discourse reasonably elevated.
A blogroll and some physics-related links can be found on our links page, as well as in pull-down menus on the sidebar at right. We have included a long, although by no means complete, listing of physics/astrophysics-oriented blogs; if you know of any such sites (including your own) falling into this category that we have missed, please let us know. We do not promise to list every blog, but we hope to be fairly inclusive.
“Cosmic Variance”
Physical theories occasionally make predictions that are statistical rather than deterministic. An example is the small deviation from perfect smoothness that characterizes the large-scale structure of the universe — our theories attempt to predict the distribution from which such deviations are drawn, but say nothing about the specifics of a particular fluctuation. When comparing such predictions to observations, we are limited by the fact that there are only a finite number of fluctuations at each scale that we can possibly observe.
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